<div class="left menu">
    <li>
        {volist name="nav3" id="vo"}
        <?php $active=strpos($vo['link'],$alias);?>
        <li {if $active}class="hover"{/if}><a href="{$vo.link}">{$vo.title}</a>{if $active}<i class="fa fa-chevron-right"></i>{/if}</li>
        {/volist}
    </ul>
</div>